US20120161630A1 - Lamp and lighting apparatus - Google Patents
Lamp and lighting apparatus Download PDFInfo
- Publication number
- US20120161630A1 US20120161630A1 US13/393,084 US201113393084A US2012161630A1 US 20120161630 A1 US20120161630 A1 US 20120161630A1 US 201113393084 A US201113393084 A US 201113393084A US 2012161630 A1 US2012161630 A1 US 2012161630A1
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- Prior art keywords
- inner casing
- circumferential surface
- casing
- protrusion
- outer circumferential
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
- F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
- F21V29/77—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical diverging planar fins or blades, e.g. with fan-like or star-like cross-section
- F21V29/773—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical diverging planar fins or blades, e.g. with fan-like or star-like cross-section the planes containing the fins or blades having the direction of the light emitting axis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V3/00—Globes; Bowls; Cover glasses
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
- F21K9/20—Light sources comprising attachment means
- F21K9/23—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
- F21K9/232—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
- F21K9/20—Light sources comprising attachment means
- F21K9/23—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
- F21K9/238—Arrangement or mounting of circuit elements integrated in the light source
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V23/00—Arrangement of electric circuit elements in or on lighting devices
- F21V23/003—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array
- F21V23/004—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array arranged on a substrate, e.g. a printed circuit board
- F21V23/006—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array arranged on a substrate, e.g. a printed circuit board the substrate being distinct from the light source holder
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V23/00—Arrangement of electric circuit elements in or on lighting devices
- F21V23/003—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array
- F21V23/007—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array enclosed in a casing
- F21V23/009—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array enclosed in a casing the casing being inside the housing of the lighting device
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
- F21V29/71—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks using a combination of separate elements interconnected by heat-conducting means, e.g. with heat pipes or thermally conductive bars between separate heat-sink elements
- F21V29/713—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks using a combination of separate elements interconnected by heat-conducting means, e.g. with heat pipes or thermally conductive bars between separate heat-sink elements in direct thermal and mechanical contact of each other to form a single system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/85—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems characterised by the material
- F21V29/87—Organic material, e.g. filled polymer composites; Thermo-conductive additives or coatings therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
- F21V29/83—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks the elements having apertures, ducts or channels, e.g. heat radiation holes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2105/00—Planar light sources
- F21Y2105/10—Planar light sources comprising a two-dimensional array of point-like light-generating elements
- F21Y2105/14—Planar light sources comprising a two-dimensional array of point-like light-generating elements characterised by the overall shape of the two-dimensional array
- F21Y2105/16—Planar light sources comprising a two-dimensional array of point-like light-generating elements characterised by the overall shape of the two-dimensional array square or rectangular, e.g. for light panels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
Abstract
A lamp capable of effectively suppressing increase in the temperature of circuit devices is provided. The lamp includes: an LED module composed of LED chips; a base through which electric power is received; a lighting circuit which includes a circuit device group for generating electric power for causing the LED module to emit light using the electric power received through the base; an inner casing which is a tubular portion made of resin for housing the lighting circuit; and an outer casing which is a tubular portion for housing the inner casing. On the circumferential surface of the inner casing, a protrusion is provided which directly abuts the inner circumferential surface of the outer casing.
Description
- The present invention relates to lamps and lighting apparatuses, and particularly relates to a lamp and a lighting apparatus using a semiconductor light-emitting device.
- In recent years, semiconductor light-emitting devices such as Light-emitting Diodes (LEDs) have been attracting attention as new light sources for lamps which can contribute to the prevention of global warming by saving energy because such LEDs provide a higher energy efficiency and have a longer product life than incandescent lamps and halogen lamps. Research and development on such LED lamps using LEDs as light sources is in progress.
- It is known that optical output of an LED decreases and the product life becomes shorter as the temperature of the LED increases. For this reason, it is necessary for such an LED lamp to have an efficient heat transfer structure in order to suppress increase in the temperature. In view of this, various kinds of LED lamps having an efficient heat transfer structure have been conventionally proposed (for example, see
Patent Literatures 1 to 3). -
FIG. 12 andFIG. 13 are a cross sectional view and an exploded perspective view of a conventional LED lamp disclosed inPatent Literature 1, respectively. As shown inFIG. 12 , in this conventional LED lamp, athrough hole 228 and afirst groove 232 allow communication between the circumferential part of anLED device 236 and the outside of theLED bulb 210. Thus, heat generated by theLED device 236 is transferred to the outside via thethrough hole 228 and thefirst groove 232. - On the other hand,
Patent Literature 2 discloses a technique for suppressing increase in the temperature in an LED by providing a metal holder formed by integrating a circumferential side surface part which is exposed to the outside and a light source attachment part. - Further,
Patent Literature 3 discloses forming a fin for increasing a heat transfer effect on the outer circumferential surface of an LED lamp. - Japanese Unexamined Patent Application Publication No. 2009-267082
- Japanese Unexamined Patent Application Publication No. 2009-037995
- Japanese Unexamined Patent Application Publication No. 2009-004130
- An LED lamp includes a lighting circuit for causing the LED to emit light, and is required to suppress increase in the temperatures of the LED and the lighting circuit (more specifically, a circuit device which constitutes the lighting circuit).
- This is because the circuit device consumes approximately 20 percent of the electric power supplied to the LED lamp, and an increase in the temperature of the circuit device increases energy loss (circuit loss) in the circuit device. Accordingly, it is also important to suppress increase in the temperature of the circuit device in order to save energy consumed by the LED lamp.
- However, none of the aforementioned conventional LED lamps does not exert any sufficient heat transfer measure for its circuit device. For this reason, each of the conventional LED lamps has a problem of being incapable of sufficiently transferring heat generated in the circuit device to the outside of the lamp when the LED emits light and thus is incapable of suppressing increase in the temperature of the circuit device.
- At first glance, the LED lamp disclosed in
Patent Literature 1 shown inFIG. 13 seems to be capable of transferring heat generated by anelectric component 256 via aninner body 258 which covers theelectric component 256 and aconvex portion 274 which is provided on the outer circumferential surface. However, in this LED lamp, theinner body 258 is fit into the inside of atubular portion 214 such that amajor diameter part 260 covers theelectric component 256, and theinner body 258 is fit with theouter body 212 such that theconvex portion 274 is provided along a second groove (inner-body fixed groove) 234 formed on an inner surface of thetubular portion 214. For this reason, theinner body 258 and theouter body 212 are not closely in contact with each other. Thus, heat generated by theelectric component 256 is not sufficiently conducted to theouter body 212. - When the temperature of a circuit device cannot be suppressed as in such cases, circuit loss caused by the circuit device decreases the energy efficiency. As a result, the product life of the circuit device is significantly shortened.
- The present invention has been made to solve such a problem with an aim to provide a lamp and a lighting apparatus which are capable of efficiently suppressing increase in the temperatures of their circuit devices.
- In order to solve the problem, a ramp according to an aspect of the present invention is a ramp comprising: a light source including a semiconductor light-emitting device; a base through which electric power is received; a lighting circuit including a circuit device which generates electric power for causing the light source to emit light, using the electric power received through the base; an inner casing which is a tubular portion made of resin for housing the lighting circuit; and an outer casing which is a tubular portion for housing the inner casing, wherein a protrusion is provided on an outer circumferential surface of the inner casing, the protrusion directly abutting an inner circumferential surface of the outer casing.
- In this way, the protrusion is provided on the outer circumferential surface of the inner casing to abut the inner circumferential surface of the outer casing. Thus, the heat generated by the circuit device is securely conducted from the inner casing to the outer casing via the protrusion and is transferred to the outside.
- Here, “the protrusion which directly abuts the inner circumferential surface of the outer casing” means that the protrusion is directly in contact, at its end, with the inner circumferential surface of the outer casing without being directly or indirectly in contact with any other structural element such as the second groove (inner-body fixed groove) 234 formed on the inner surface of the
tubular portion 214 inPatent Literature 1. Here, it is only necessary that at least “the protrusion which directly abuts the inner circumferential surface of the outer casing” is provided on the outer circumferential surface of the inner casing of the lamp according to the present invention. Naturally, it is also possible to further provide any other protrusion (a protrusion which is in contact with another element). Furthermore, the protrusion may abut the inner circumferential surface of the outer casing in a state where the end portion is transformed. The protrusion is in contact, at its end portion, with the inner surface of the outer casing in the state where the end portion is transformed with power strong enough to transform the end portion. Thus, it is possible to increase the closeness between the inner casing and the outer casing, and to thereby increase the heat conduction efficiency. In addition, it is possible to reduce size differences between the components of the inner casing and the outer casing by transforming the protrusion even when the components have some size differences. - Here, the protrusion may have a linear structure extending in a circumferential direction of the outer circumferential surface of the inner casing. At this time, the protrusion should preferably have a plurality of linear portions each having the linear structure. This is because the linear portions increase the heat transfer effect.
- In addition, the linear portions may be arranged, at a certain interval, on a circumference on the outer circumferential surface of the inner casing. Since the linear portions are arranged at a constant interval in this way, a gap is secured between adjacent ones of the linear portions. This prevents the space enclosed by the outer circumferential surface of the inner casing and the inner circumferential surface of the outer casing from being sealed by the linear portions, and secures air convection in the space. Thereby, it is possible to prevent a local increase in the temperature of the lamp.
- In addition, the linear portions may be provided on mutually different circumferences on the outer circumferential surface of the inner casing. For example, the inner casing may include a first opening which is open toward the light source and a second opening which is positioned opposite to the first opening, and the linear portions may include: a linear portion which is provided on a circumference that is closer to the second opening than to the first opening on the outer circumferential surface of the inner casing; and a linear portion which is provided on a circumference that is closer to the first opening than to the second opening on the outer circumferential surface of the inner casing. In this way, the linear portions provided at the positions in the axis direction of the outer circumferential surface of the inner casing fix, to have a certain distance, the outer circumferential surface of the inner casing and the inner circumferential surface of the outer casing. These linear portions increase the strength in the temporal fixing of the inner casing in the outer casing when the lamp components are assembled, increasing operability in the assembly process.
- Here, the “axis direction” is a direction that is parallel or approximately parallel to the rotation axis when the lamp is seen as a rotation body.
- In addition, at least one of the linear portions may be provided along an entire circumference on the outer circumferential surface of the inner casing. In this way, it is possible to securely conduct the heat generated by the circuit device via the protrusion irrespective of the position of the inner casing in the circumferential direction on the outer circumferential surface.
- Here, the protrusion may include a linear structure extending in an axis direction of the tubular portion in the outer circumferential surface of the inner casing. At this time, the protrusion should preferably have a plurality of linear portions each having the linear structure. In this way, the linear portions provided at the positions in the axis direction of the outer circumferential surface of the inner casing increase the heat transfer effect and fix, to have a certain distance, the outer circumferential surface of the inner casing and the inner circumferential surface of the outer casing. Thus, these linear portions increase the strength in the temporal fixing of the inner casing in the outer casing when the lamp components are assembled, increasing operability in the assembly process.
- In addition, the protrusion may include a plurality of columnar portions each having a columnar structure which protrudes out from the outer circumferential surface of the inner casing toward an inner circumferential surface of the outer casing. At this time, the columnar portions should preferably be arranged on a circumference on the outer circumferential surface of the inner casing. In this way, the linear portions provided at the positions in the axis direction of the outer circumferential surface of the inner casing increase the heat transfer effect and fix, to have a certain distance, the outer circumferential surface of the inner casing and the inner circumferential surface of the outer casing. Thus, these linear portions increase the strength in the temporal fixing of the inner casing in the outer casing when the lamp components are assembled, increasing operability in the assembly process.
- In addition, the protrusion should preferably be provided at least in an area which covers the circuit device and is on the outer circumferential surface of the inner casing. In this way, the protrusion is provided at a position close to the circuit device which generates heat. This increases the heat transfer effect. Here, the “area which covers the circuit element on the outer circumferential surface of the inner casing” means an area which is of the outer circumferential surface of the inner casing and inside of which the circuit device is present in the axis direction.
- In addition, the protrusion may be formed integrally with the inner casing. In this way, the protrusion is formed integrally with the inner casing by using a metal frame when manufacturing the inner casing. This prevents increase in the number of components and in the number of man hours required for the assembly process.
- In contrast, the protrusion may be formed independently from the inner casing. For example, the protrusion may have a circular structure which encloses the entire one of the circumferences on the outer circumferential surface of the inner casing and may function as the protrusion of the inner casing when the protrusion is fit into the inner casing. In this way, it is possible to modify a conventional lamp having an inner casing without any protrusion into a lamp having an excellent heat transfer effect according to the present invention by adding a protrusion independent from the inner casing to the conventional lamp.
- In addition, the protrusion may be formed by cutting a part of the side surface of the inner casing and turning up the part outward. In this case, the protrusion generated by cutting and turning up outward the part of the inner casing becomes in contact with the inner circumferential surface of the outer casing, increasing the closeness and the heat transfer effect. Furthermore, the protrusion increases the strength of the temporal fixing of the inner casing inside the outer casing in the assembly process, increasing the operability in the assembly process.
- Furthermore, the present invention can be implemented not only as a lamp but also as a lighting apparatus including the lamp and a lighting tool etc. which supports the lamp.
- A protrusion provided on the outer circumferential surface of the inner casing is directly in contact with the inner circumferential surface of the outer casing, which increases the contact area between the inner casing and the outer casing. The protrusion increases the heat transfer effect to the heat generated by a circuit device, protects the circuit device from the heat, and thereby allows the light source to exert a desired effect.
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FIG. 1 is an external view of a lamp according to an embodiment of the present invention. -
FIG. 2 is a cross sectional view of the lamp according to the embodiment of the present invention. -
FIG. 3 is an exploded perspective view of the lamp according to the embodiment of the present invention. - (a) of
FIG. 4 is a perspective view of an inner casing included in the lamp according to the embodiment of the present invention. (b) ofFIG. 4 is a plan view of the inner casing when seen from the side of an LED module. - (a) of
FIG. 5 is a perspective view of an inner casing according toVariation 1 in the present invention. (b) ofFIG. 5 is a plan view of the inner casing when seen from the side of an LED module. - (a) of
FIG. 6 is a perspective view of an inner casing according toVariation 2 in the present invention. (b) ofFIG. 6 is a plan view of the inner casing when seen from the side of an LED module. - (a) of
FIG. 7 is a perspective view of an inner casing according toVariation 3 in the present invention. (b) ofFIG. 7 is a plan view of the inner casing when seen from the side of an LED module. - (a) of
FIG. 8 is a perspective view of an inner casing according toVariation 4 in the present invention. (b) ofFIG. 8 is a plan view of the inner casing when seen from the side of an LED module. - (a) of
FIG. 9 is a perspective view of an inner casing according toVariation 5 in the present invention. (b) ofFIG. 9 is a plan view of the inner casing when seen from the side of an LED module. - Each of (a) to (c) of
FIG. 10 is a perspective view of an inner casing according to another variation in the present invention. -
FIG. 11 is a schematic cross sectional view of a lighting apparatus according to the present invention. -
FIG. 12 is a cross sectional view of a conventional bulb LED lamp. -
FIG. 13 is an exploded perspective view of a conventional bulb LED lamp. - Hereinafter, a lamp and a lighting apparatus according to an embodiment of the present invention are described with reference to the drawings.
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FIG. 1 is a schematic view of thelamp 10 according to this embodiment of the present invention.FIG. 2 is a cross sectional view of thelamp 10 when thelamp 10 is cut on a surface including a center axis A to A′ inFIG. 1 .FIG. 3 is an exploded perspective view of thelamp 10. - This
lamp 10 is a bulb LED lamp, and has a lamp cover including aglobe 1, abase 2, and anouter casing 3 provided between theglobe 1 and thebase 2. - This
globe 1 is a hemispherical transparent cover for emitting light from theLED module 4 to the outside. TheLED module 4 is covered by theglobe 1. In addition, theglobe 1 is subjected to light dispersion processing such as grinding for dispersing light emitted from theLED module 4. Theglove 1 has a shape tapered toward an opening, and an end portion of the opening of thisglobe 1 is positioned to abut an upper surface of a lightsource attachment member 5. Theglobe 1 is fixed on theouter casing 3 using a Silicone adhesive having a heat resistance. Here, the shape of theglobe 1 is not limited to a hemisphere, and a rotation oval body and an oblate body are also possible. In addition, although the material of theglobe 1 is a glass material in this embodiment, the material of theglobe 1 is not limited to the glass material. Theglobe 1 may be formed using a synthesized resin or the like. - The
base 2 is an electricity receiving part for receiving alternating electric power by two contact points. The electric power received by thebase 2 is input to an electric power input unit of acircuit board 72 via a lead line (not shown). In addition, thebase 2 is a tubular portion having a bottom surface and made of metal, and further has ahollow part 2 a inside. In this embodiment, thebase 2 is an E-shaped, and includes, on its outer surface, ascrew part 2 b for screwing into a socket (not shown) of the lighting apparatus. In addition, thebase 2 includes, on its inner circumferential surface, ascrew part 2 c for screwing into asecond casing part 62 of aninner casing 6 described later. - The
outer casing 3 is an enclosure of a tubular heat transfer portion made of metal and including vertically arranged two openings of afirst opening 3 a which is the opening at the side of theglobe 1 and asecond opening 3 b which is the opening at the side of thebase 2. The diameter of thefirst opening 3 a is larger than the diameter of thesecond opening 3 b, and theouter casing 3 is a cylindrical portion having an inverse circular truncated cone shape as a whole. In this embodiment, theouter casing 3 is made using an aluminum alloy material. In addition, the surface of theouter casing 3 is subjected to anodic oxide coating, which increases the heat emission efficiency. - As shown in
FIG. 2 andFIG. 3 , thelamp 10 according to the embodiment of the present invention further includes anLED module 4, a lightsource attachment member 5, aninner casing 6, alighting circuit 7, and an insulatingring 8. - The
LED module 4 is an example of a light source composed of a semiconductor light-emitting device, and a light-emitting module (light-emitting unit) which emits predetermined light. TheLED module 4 is composed of arectangular ceramics board 4 a, a plurality ofLED chips 4 b which is mounted on one side of theceramics board 4 a, and a sealingresin 4 c for sealing theseLED chips 4 b. The sealingresin 4 c includes predetermined phosphor particles dispersed inside. These phosphor particles convert the color of light emitted from theseLED chips 4 b to a desired color. - In this embodiment, blue LEDs which emit blue light are used as
such LED chips 4 b and yellow phosphor particles are used as such phosphor particles. In this case, the yellow phosphor particles emit yellow light excited by blue light from the blue LEDs, and white light generated through synthesis of the yellow light and the blue light from the blue LEDs is emitted from theLED module 4. - Here, in this embodiment, approximately 100
LED chips 4 b are mounted in a matrix-shape arrangement on theceramics board 4 a. TheLED module 4 is provided with twoelectrodes circuit board 72. The LED chips 4 b emit light when direct electric power is supplied from these twoelectrodes LED module 4. - The light
source attachment member 5 is a holder (module plate) made using a metal board for disposing theLED module 4, and is formed to have a disc shape by aluminum die-casting. The lightsource attachment member 5 is a heat transfer portion which conducts heat generated from theLED module 4 to theouter casing 3. The lightsource attachment member 5 is mounted at the side of thefirst opening 3 a of theouter casing 3 and is thermally connected to the light source of theLED module 4 and theouter casing 3. Thelight attachment member 5 abuts, at its side portion, an inner upper surface of thefirst opening 3 a of theouter casing 3. In other words, the lightsource attachment member 5 is fit into the part which is of theouter casing 3 and at the side of thefirst opening 3 a. In addition, the lightsource attachment member 5 includes aconcave portion 5 a which is formed in order to arrange theLED module 4. In this embodiment, theconcave portion 5 a is formed to have a rectangular shape similar to the shape of theceramics board 4 a of theLED module 4. TheLED module 4 disposed on theconcave portion 5 a is held by aclasp 4 d. Here, the lightsource attachment member 5 on which the light source is disposed and theouter casing 3 are independent members, but may be formed as an integrated component. - The
inner casing 6 is a tubular portion made of resin for housing thelighting circuit 7 composed of acircuit device group 71, and includes theouter casing 3, afirst casing part 61 which is a cylindrical portion having an inverse circular truncated cone shape which is approximately the same as the shape of theouter casing 3, and asecond casing part 62 which is a cylindrical portion having approximately the same shape as the shape of thebase 2. Theinner casing 6 functions as an insulation casing for preventing contact between thecircuit device group 71 and theouter casing 3 made of metal. - The
first casing part 61 includes afirst opening 61 a which faces the side of the LED module 4 (opposite to the side of the second casing part 62). Thefirst casing part 61 has, on the outer circumferential surface, aprotrusion 65 which directly abuts the inner circumferential surface of theouter casing 3. Theprotrusion 65 takes roles for conducting heat generated by thecircuit device group 71 to theouter casing 3 and fixing theinner casing 6 and theouter casing 3 with a certain gap (2 to 3 mm). - Here, the
protrusion 65 is directly in contact with the inner circumferential surface of theouter casing 3. Theprotrusion 65 is directly in contact, at its end, with the inner circumferential surface of theouter casing 3 without being directly or indirectly in contact with any other structural elements. Here, it is only necessary that theinner casing 6 according to the present invention includes such aprotrusion 65, and it is also good that theinner casing 6 further includes any other protrusion which is in contact with a structural element other than theouter casing 3. - The
second casing part 62 includes thesecond opening 62 a which faces the side of the base 2 (opposite to the side of the first casing part 61). The outer circumferential surface of the second casing part is formed to be in contact with the inner circumferential surface of thebase 2. In this embodiment, a screw-fit part 62 b for fitting with thebase 2 is provided on the outer circumferential surface of thesecond casing part 62. With the screw-fit part 62 b, thesecond casing part 62 is in contact with thebase 2. In the case where the end portion of theprotrusion 65 has a sharp shape as shown inFIG. 4 , it is possible to increase the contact performance between theprotrusion 65 and theouter casing 3 by pressing the end portion into theouter casing 3 so that the end portion is transformed. Alternatively, it is possible to make the sharp end portion of theprotrusion 65 transformed and contact with the inner surface of theouter casing 3 by fitting thebase 2 into the screw-fit part 62 b of theinner casing 6. - In this embodiment, the
first casing part 61, theprotrusion 65, and thesecond casing part 62 which constitute theinner casing 6 are integrally formed by metal injection molding. This inner casing 6 (comprising thefirst casing part 61, theprotrusion 65, and the second casing part 62) is molded by using, for example, Polybutyleneterephtalate (PBT) containing, at a percentage in a range from 15 to 40 percent, aluminum oxide whose particle diameter ranges from 1 μm to 10 μm. Here, it is also good to use, as a material for theinner casing 6, Poly Phenylene Sulfide Resin (PPS) containing, at a percentage in a range from 10 to 40 percent, zinc oxide (ZnO) whose particle diameter rages from 1 μm to 10 μm. To sum up, it is preferable that a resin having a high thermal conductivity should be used as a material for theinner casing 6. - The
first opening 61 a at the side of the lightsource attachment member 5 of thefirst casing part 61 includes aresin cap 63 attached thereto. Thisresin cap 63 seals the side of the lightsource attachment member 5 of theinner casing 6. - The
resin cap 63 is approximately disc-shaped, and includes, on the outer circumferential end portion at its inner surface side, acircular protrusion 63 a which protrudes in the depth direction of the inner casing. Theprotrusion 63 a includes, on the inner circumferential surface, a plurality of engagement nails (not shown) formed to engage the circuit board. Theprotrusion 63 a is configured to be fit into the end portion of thefirst opening 61 a in thefirst casing part 61 of theinner casing 6. Thisresin cap 63 can be molded using the same material as the material of theinner casing 6. In addition, preferably, a resin having a high thermal conductivity should be used as a material for theresin cap 63. Here, theresin cap 63 includes a throughhole 63 b formed to allow passage of the lead line for supplying electric power to theLED module 4. - The
lighting circuit 7 includes acircuit device group 71 which constitutes a circuit (power source circuit) for causing theLED chips 4 b in theLED module 4 to emit light and acircuit board 72 on which the respective circuit devices of thecircuit device group 71 are mounted. - The
circuit device group 71 is composed of the circuit devices for generating electric power for causing the light source (LED module 4) to emit light, using the electric power received by thebase 2. Thecircuit device group 71 converts alternating electric power received by thebase 2 into direct electric power, and supplies the direct electric power to theLED chips 4 b of theLED module 4 via theelectrodes circuit device group 71 includes afirst capacitor device 71 a which is an electrolytic capacitor (vertical capacitor), asecond capacitor device 71 b which is a ceramic capacitor (horizontal capacitor), avoltage conversion device 71 d made of a coil, and asemiconductor device 71 e which is an integrated circuit of an intelligent power device (IPD). Among the circuit devices constituting thecircuit device group 71, circuit devices which particularly require a heat transfer measure are the components which generate a large amount of heat which are a capacitor device (especially thefirst capacitor device 71 a) and asemiconductor device 71 e. - A
circuit board 72 is a disc-shaped printed board having thecircuit device group 71 mounted on one of its surfaces. As described above, thiscircuit board 72 is held by theresin cap 63 having the engagement nails. Here, thecircuit board 72 includes cutout portions. These cutout portions constitute a pathway for passing a lead line for supplying direct electric power to theLED module 4 to the surface opposite to the surface on which thecircuit device group 71 is mounted. - The insulating
ring 8 is for securely insulating thebase 2 and theouter casing 3, and is disposed between thebase 2 and theouter casing 3. The insulatingring 8 abuts, at the inner circumferential surface, the outer circumferential surface of thesecond casing part 62 of theinner casing 6. This insulatingring 8 is held by the opening end portion of thebase 2 and the opening end portion of theouter casing 3 when thesecond casing part 62 of theinner casing 6 and thebase 2 are screw-fit with each other. Here, preferably, the insulatingring 8 should be made of resin having a high thermal conductivity. - Next, a description is given of a unique structure of the
lamp 10 configured as described above according to this embodiment. - (a) of
FIG. 4 is a perspective view of theinner casing 6 of thelamp 10 shown in any one ofFIG. 1 toFIG. 3 . (b) ofFIG. 4 is a plan view of theinner casing 6 when seen from the side of theLED module 4. Thisinner casing 6 includes, on the outer circumferential surface (more specifically, on the first casing part 61), aprotrusion 65 which directly abuts the inner circumferential surface of theouter casing 3. - The
protrusion 65 is composed of a plurality of (here, four)linear portions 65 a to 65 d extending in the circumferential direction of the outer circumferential surface of theinner casing 6. In this embodiment, theselinear portions 65 a to 65 d are columnar portions which have a long horizontal side and have a triangle shape protruding from the outer circumferential surface of theinner casing 6 to the inner circumferential surface of the outer casing 3 (theselinear portions 65 a to 65 d are columnar portions having a triangle-shaped cross section and are fixed along the circumferential direction of the inner casing 6). Theselinear portions 65 a to 65 d are formed by attaching convex portions having such a shape to theinner casing 6 or transforming theinner casing 6 such that the side surface of theinner casing 6 is partly protruded. Theselinear portions 65 a to 65 d are arranged along one of the circumferences on the outer circumferential surface of theinner casing 6 at a certain interval (for example, 5 mm to 10 mm). Here, in this DESCRIPTION, “horizontal” and “vertical” directions means the “horizontal” and “vertical” directions in the case where the drawings are seen from the front. - These
linear portions 65 a to 65 d constituting theprotrusion 65 increase the effect of transferring heat generated in thecircuit device group 71 from theinner casing 6 to theouter casing 3. Since theselinear portions 65 a to 65 d are arranged at the certain interval, gaps are secured between adjacent ones of thelinear portions 65 a to 65 d. This prevents the space enclosed by the outer circumferential surface of theinner casing 6 and the inner circumferential surface of theouter casing 3 from being sealed by theselinear portions 65 a to 65 d, and secures air convection in the space. Thereby, it is possible to prevent a local increase in the temperature of the lamp. Here, in thelamp 10 in this embodiment, heat generated from theLED module 4 is conducted to theouter casing 3. Thus, in the case where the amount of heat generated by theLED module 4 is smaller than the amount of heat generated by thecircuit device group 71, heat generated inside thecircuit device group 71 is efficiently transferred from theinner casing 6 to theouter casing 3 via theprotrusion 65. - Here, it is only necessary that these
linear portions 65 a to 65 d are formed integrally with theinner casing 6 so as to have a convex structure protruding toward the inner circumferential surface of theouter casing 3. Thus, theselinear portions 65 a to 65 d may be columnar portions having a rectangular cross section or a circular cross section, instead of a triangle cross section. In addition, the number of linear portions arranged on one of the circumferences on the outer circumferential surface of theinner casing 6 is not limited to 4, any other numbers (such as 2, 3, 5, and numbers greater than 5) are also possible. Furthermore, theselinear portions 65 a to 65 d may be arranged at the same interval or at different intervals. - Next, descriptions are given of other embodiments (variations) of the inner casing of a lamp according to the present invention.
- First, a description is given of
Variation 1 of the inner casing of the lamp according to the present invention. - In
FIG. 5 , (a) is a perspective view of theinner casing 16 according toVariation 1, and (b) is a plan view of theinner casing 16 when seen from the side of anLED module 4. - This
inner casing 16 includes, on the outer circumferential surface (more specifically, at thefirst casing part 16 a), aprotrusion 17 which directly abuts the inner circumferential surface of theouter casing 3. - The
protrusion 17 is composed of a plurality of (here, twelve)linear portions 17 a to 17 h extending in the circumferential direction of the outer circumferential surface of theinner casing 16. Theselinear portions 17 a to 17 h correspond to three sets of fourlinear portions 65 a to 65 d according to the firstly-described embodiment. The respective three sets of the four linear portions are provided on different circumferences on the outer circumferential surface of theinner casing 16. More specifically, among the twelvelinear portions 17 a to 17 h, a first set of four of thelinear portions 17 a to 17 h is arranged on one of the circumferences on the outer circumferential surface of theinner casing 16 at a certain interval; a second set of four of thelinear portions 17 a to 17 h is arranged on another of the circumferences on the outer circumferential surface of theinner casing 16 at a certain interval; and a third set of the remaining four of thelinear portions 17 a to 17 h is arranged on another of the circumferences on the outer circumferential surface of theinner casing 16 at a certain interval. - These
linear portions 17 a to 17 h constituting theprotrusion 17 increases the effect of transferring heat generated in thecircuit device group 71 from theinner casing 16 to theouter casing 3. Since theselinear portions 17 a to 17 h are arranged at the certain interval, gaps are secured between adjacent ones of thelinear portions 17 a to 17 h. This prevents the space enclosed by the outer circumferential surface of theinner casing 16 and the inner circumferential surface of theouter casing 3 from being sealed by theselinear portions 17 a to 17 h, and secures air convection in the space. Thereby, it is possible to prevent a local increase in the temperature of the lamp. - Furthermore, the
linear portions 17 a to 17 h provided at the positions in the axis direction (the aforementioned central axis direction) of the outer circumferential surface of theinner casing 16 fix, to have a certain distance, the outer circumferential surface of theinner casing 16 and the inner circumferential surface of theouter casing 3. Thus, these linear portions increase the strength in the temporal fixing of theinner casing 16 in theouter casing 3 when the lamp components are assembled, increasing operability in the assembly process. - Here, it is only necessary that these
linear portions 17 a to 17 h are formed integrally with theinner casing 16 so as to have a convex structure protruding toward the inner circumferential surface of theouter casing 3. Thus, theselinear portions 17 a to 17 h may be columnar portions having a rectangular cross section or a circular cross section, instead of a triangle cross section. In addition, the number of linear portions arranged on one of the circumferences on the outer circumferential surface of theinner casing 16 is not limited to 4, any other numbers (such as 2, 3, 5, and numbers greater than 5) are also possible. Furthermore, theselinear portions 17 a to 17 h may be arranged at the same interval or at different intervals. - First, a description is given of
Variation 2 of the inner casing of a lamp according to the present invention. - In
FIG. 6 , (a) is a perspective view of theinner casing 26 according toVariation 2, and (b) is a plan view of theinner casing 26 when seen from the side of anLED module 4. - This
inner casing 26 includes, on the outer circumferential surface (more specifically, at thefirst casing part 26 a), aprotrusion 27 which directly abuts the inner circumferential surface of theouter casing 3. - The
protrusion 27 is composed of a plurality of (here, three)linear portions 27 a to 27 c extending in the circumferential direction of the outer circumferential surface of theinner casing 26. Theselinear portions 27 a to 27 c are formed on different ones (here, three different circumferences) of circumferences on the outer circumferential surface of theinner casing 26, so as to enclose the entire one of the circumferences on the outer circumferential surface of theinner casing 26. In this variation, theselinear portions 27 a to 27 c are columnar portions which have a long horizontal side and protrude from the outer circumferential surface of theinner casing 26 to the inner circumferential surface of the outer casing 3 (theselinear portions 27 a to 27 c are columnar portions having a rectangular cross section and are fixed along the circumferential direction of the inner casing 26). Theselinear portions 27 a to 27 c are formed by attaching convex portions having such a shape to theinner casing 26 or transforming theinner casing 26 such that the side surface of theinner casing 26 is partly protruded. - These
linear portions 27 a to 27 c include (i) thelinear portions second opening 62 a than to afirst opening 61 a on the outer circumferential surface of theinner casing 26 and (ii) thelinear portion 27 a which is provided on one of the circumferences which is closer to thefirst opening 61 a than to thesecond opening 62 a. Thelinear portion 27 a located above thelinear portions outer casing 3 and theinner casing 26 with secured gaps and a function of transferring heat from thecircuit device group 71. On the other hand, thelinear portions linear portion 27 a are positioned on the circumference which is closer to the circuit device (for example, thefirst capacitor device 71 a) which generates a particularly large amount of heat on the outer circumferential surface of theinner casing 26, and dedicatedly exerts the heat transfer function. In this embodiment, the number of thelinear portion 27 a located above (here, one) is designed to be smaller than the number of thelinear portions inner casing 26 is closer to theLED module 4 having a high temperature and thus provides a low heat transfer effect, and that the lower part is closer to thebase 2 though which heat is easily conducted to the outside and thus provides a high heat transfer effect. - These
linear portions 27 a to 27 c increase the effect of transferring heat generated in thecircuit device group 71 from theinner casing 26 to theouter casing 3. - Furthermore, the
linear portions 27 a to 27 c provided at the positions in the axis direction of the outer circumferential surface of theinner casing 26 fix, to have a certain distance, the outer circumferential surface of theinner casing 26 and the inner circumferential surface of theouter casing 3. Thus, these linear portions increase the strength in the temporal fixing of theinner casing 26 in theouter casing 3 when the lamp components are assembled, increasing operability in the assembly process. - Here, it is only necessary that these
linear portions 27 a to 27 c are formed integrally with theinner casing 26 so as to have a convex structure protruding toward the inner circumferential surface of theouter casing 3. Thus, theselinear portions 27 a to 27 c may be columnar portions having a triangle cross section or a circular cross section, instead of a rectangular cross section. In addition, the number of linear portions arranged on one of the circumferences on the outer circumferential surface of theinner casing 26 is not limited to 3, any other numbers (such as 2, 4 and numbers greater than 4) are also possible. - First, a description is given of
Variation 3 of the inner casing of a lamp according to the present invention. - In
FIG. 7 , (a) is a perspective view of theinner casing 36 according toVariation 3, and (b) is a plan view of theinner casing 36 when seen from the side of anLED module 4. - This
inner casing 36 includes, on the outer circumferential surface (more specifically, at thefirst casing part 36 a), aprotrusion 37 which directly abuts the inner circumferential surface of theouter casing 3. - The
protrusion 37 is composed of a plurality of (here, four)linear portions 37 a to 37 d extending in the circumferential direction of the outer circumferential surface of theinner casing 36. In this variation, theselinear portions 37 a to 37 d are protrusions having a long vertical side and having a triangle shape protruding from the outer circumferential surface of theinner casing 36 to the inner circumferential surface of the outer casing 3 (theselinear portions 37 a to 37 d are triangular-pyramid portions having a triangle-shaped cross section which decreases toward the bottom). Theselinear portions 37 a to 37 d are formed by attaching convex portions having such a shape to theinner casing 36 or transforming theinner casing 36 such that the side surface of theinner casing 36 is partly protruded. Theselinear portions 37 a to 37 d are arranged on the outer circumferential surface on theinner casing 36 at a certain interval (here, at positions determined by segmenting, in units of 90 degrees, the circumference of the outer circumferential surface of the inner casing 36). - These
linear portions 37 a to 37 d are provided in an area which is on the outer circumferential surface of theinner casing 36 and covers thecircuit device group 71, that is, the area in which thecircuit device group 71 is present in the axis (vertical) direction on the outer circumferential surface of theinner casing 36. - These
linear portions 37 a to 37 d which constitute theprotrusion 37 are provided at the positions (in the axis direction) close to the circuit device which generates heat, increasing the heat transfer effect. Furthermore, thelinear portions 37 a to 37 d provided at the positions in the axis direction of the outer circumferential surface of theinner casing 36 fix, to have a certain distance, the outer circumferential surface of theinner casing 36 and the inner circumferential surface of theouter casing 3. Thus, these linear portions increase the strength in the temporal fixing of theinner casing 36 in theouter casing 3 when the lamp components are assembled, increasing operability in the assembly process. - Here, it is only necessary that these
linear portions 37 a to 37 d are formed integrally with theinner casing 36 so as to have a convex structure protruding toward the inner circumferential surface of theouter casing 3. Thus, theselinear portions 37 a to 37 d may be protrusions having a rectangular or circular cross section, instead of a triangle cross section. In addition, the number of linear portions arranged on one of the circumferences on the outer circumferential surface of theinner casing 36 is not limited to 4, any other numbers (such as 2, 3, 5 and numbers greater than 5) are also possible. Furthermore, theselinear portions 37 a to 37 d may be arranged at the same interval or at different intervals. - First, a description is given of
Variation 4 of the inner casing of a lamp according to the present invention. - In
FIG. 8 , (a) is a perspective view of theinner casing 46 according toVariation 1, and (b) is a plan view of theinner casing 46 when seen from the side of anLED module 4. - This
inner casing 46 includes, on the outer circumferential surface (more specifically, at thefirst casing part 46 a), aprotrusion 47 which directly abuts the inner circumferential surface of theouter casing 3. - The
protrusion 47 is composed of a plurality of linear portions (fins) 47 a to 47 c extending in the axis (vertical) direction of the outer circumferential surface of theinner casing 46. In this variation, theselinear portions 47 a to 47 c are protrusions having a long vertical side and having a rectangle shape protruding from the outer circumferential surface of theinner casing 46 to the inner circumferential surface of the outer casing 3 (theselinear portions 47 a to 47 c are square-pyramid portions having a rectangular cross section which decreases toward the bottom). Theselinear portions 47 a to 47 c are formed by attaching convex portions having such a shape to theinner casing 46 or transforming theinner casing 46 such that the side surface of theinner casing 46 is partly protruded. Theselinear portions 47 a to 47 c compose heat transfer fins and are arranged on the outer circumferential surface of theinner casing 46 at a certain interval such that convexes and concaves alternately appear in the circumferential direction of the outer circumferential surface of theinner casing 46. - These
linear portions 47 a to 47 c are provided in an area which is on the outer circumferential surface of theinner casing 46 and covers thecircuit device group 71, that is, the area in which thecircuit device group 71 is present in the axis (vertical) direction on the outer circumferential surface of theinner casing 46. - These
linear portions 47 a to 47 c which constitute theprotrusion 47 are provided at the positions (in the axis direction) close to the circuit device which generates heat, increasing the heat transfer effect. Furthermore, thelinear portions 47 a to 47 c provided at the positions in the axis direction of the outer circumferential surface of theinner casing 46 fix, to have a certain distance, the outer circumferential surface of theinner casing 46 and the inner circumferential surface of theouter casing 3. Thus, these linear portions increase the strength in the temporal fixing of theinner casing 46 in theouter casing 3 when the lamp components are assembled, increasing operability in the assembly process. - Here, it is only necessary that these
linear portions 47 a to 47 c are formed integrally with theinner casing 46 so as to have a convex structure protruding toward the inner circumferential surface of theouter casing 3. Thus, theselinear portions 47 a to 47 c may be protrusions having a triangular cross section or a circular cross section, instead of a rectangular cross section. There is no need to provide such aprotrusion 47 on the entire circumference among circumferences in the circumferential direction of the outer circumferential surface of theinner casing 46. For example, it is also good to provide such aprotrusion 47 at a position at which the temperature is increased by thecircuit device group 71. - Next, a description is given of
Variation 5 of the inner casing of a lamp according to the present invention. - In
FIG. 9 , (a) is a perspective view of theinner casing 56 according toVariation 5, and (b) is a plan view of theinner casing 56 when seen from the side of anLED module 4. - This
inner casing 56 includes, on the outer circumferential surface (more specifically, at thefirst casing part 56 a), aprotrusion 57 which directly abuts the inner circumferential surface of theouter casing 3. - The
protrusion 57 is composed of a plurality of (here, four)columnar portions 57 a to 57 d extending in the circumferential direction of the outer circumferential surface of theinner casing 56. In this variation, thesecolumnar portions 57 a to 57 d are rectangle-column portions which protrude out in the direction from the outer circumferential surface of theinner casing 56 to the inner circumferential surface of theouter casing 3. Thesecolumnar portions 57 a to 57 are formed by attaching convex portions having such a shape to theinner casing 56 or transforming theinner casing 56 such that the side surface of theinner casing 56 is partly protruded. Thesecolumnar portions 57 a to 57 d are arranged on the outer circumferential surface on theinner casing 56 at a certain interval (here, at positions determined by segmenting, in units of 90 degrees, the circumference of the outer circumferential surface of the inner casing 56). - These
columnar portions 57 a to 57 d constituting theprotrusion 57 increase the effect of transferring heat generated in thecircuit device group 71 from theinner casing 56 to theouter casing 3. Since thesecolumnar portions 57 a to 57 d are arranged at the certain interval, gaps are secured between adjacent ones of thecolumnar portions 57 a to 57 d. This prevents the space enclosed by the outer circumferential surface of theinner casing 56 and the inner circumferential surface of theouter casing 3 from being sealed by thesecolumnar portions 57 a to 57 d, and secures air convection in the space. Thereby, it is possible to prevent a local increase in the temperature of the lamp. - Furthermore, the
columnar portions 57 a to 57 d provided at the positions in the axis direction of the outer circumferential surface of theinner casing 56 fix, to have a certain distance, the outer circumferential surface of theinner casing 56 and the inner circumferential surface of theouter casing 3. Thus, these columnar portions increase the strength in the temporal fixing of theinner casing 56 in theouter casing 3 when the lamp components are assembled, increasing operability in the assembly process. - Here, it is only necessary that these
columnar portions 57 a to 57 d are formed integrally with theinner casing 56 and have a convex structure which protrudes toward the inner circumferential surface of theouter casing 3. Thesecolumnar portions 57 a to 57 d may be triangular-column portions or circular-column portions, instead of rectangular-column portions which protrude out toward the inner circumferential surface of theouter casing 3. In addition, the number of columnar portions arranged on one of the circumferences on the outer circumferential surface of theinner casing 56 is not limited to 4, any other numbers (such as 2, 3, 5 and numbers greater than 5) are also possible. Furthermore, thesecolumnar portions 57 a to 57 d may be arranged at the same interval or at different intervals. - Next, descriptions are given of Variations of inner casings of lamps according to the present invention.
- In
FIG. 10 , (a) is a perspective view of aninner casing 66 according to one of the variations. Thisinner casing 66 includes, on the outer circumferential surface (more specifically, at thefirst casing part 66 a), a protrusion 67 which directly abuts the inner circumferential surface of theouter casing 3. This protrusion 67 includes alinear portion 67 a having the same structure as that of thelinear portion 27 a according toVariation 2 andcolumnar portions 67 b to 67 d having the same structure as those of thecolumnar portions 57 a to 57 c according toVariation 5. - Here, the
columnar portions 67 b to 67 d are not arranged evenly in the circumferential direction on the outer circumferential surface of theinner casing 56, but only at the positions corresponding to circuit devices (for example, thefirst capacitor device 71 a) which generate a particularly large amount of heat in thecircuit device group 71. In this way, it is possible to provide a higher heat transfer effect for the circuit devices which generate heat more easily. - In
FIG. 10 , (b) is a perspective view of aninner casing 68 according to one of the variations. Thisinner casing 68 includes, on the outer circumferential surface (more specifically, at thefirst casing part 68 a), aprotrusion 69 which directly abuts the inner circumferential surface of theouter casing 3. Here, theprotrusion 69 includes acircular portion 69 a having the same shape as that of thelinear portion 67 a shown in (a) ofFIG. 10 andconvex portions 69 b to 69 d arranged at the same positions as those of thecolumnar portions 67 b to 67 d shown in (a) ofFIG. 10 . - Here, the
circular portion 69 a has the same shape as that of thelinear portion 67 a shown in (a) ofFIG. 10 , but is formed independently from theinner casing 68. Thus, thecircular portion 69 a is different from thelinear portion 67 a in the point of functioning as the protrusion of theinner casing 68 when fit into the outer circumference of theinner casing 68. In this way, it is possible to modify a conventional lamp having an inner casing without any protrusion into a lamp having an excellent heat transfer effect according to the present invention by adding a protrusion (thecircular portion 69 a) independent from the inner casing to the conventional lamp. - The attachment positions for the
convexes 69 b to 69 d are the same as those of thecolumnar portions 67 b to 67 d shown in (a) ofFIG. 10 . However, unlike the case of thecolumnar portions 67 b to 67 d, each of theseconvexes 69 b to 69 d is formed by cutting and turning up outward a part of the side surface of theinner casing 68 such that the part corresponds to a rectangle (specifically, three sides of the rectangle are cut and then turned up outward). In this way, the part generated by cutting and turning up outward the part to transform theinner casing 68 and serving as the part of theprotrusion 69 becomes in contact with the inner circumferential surface of theouter casing 3, increasing the closeness and heat transfer effect. Furthermore, the part increases the strength of the temporal fixing of theinner casing 68 in theouter casing 3 when the components are assembled and operability in the assembly process. - Here, as for the direction for cutting and turning up outward the part of the side surface of the
inner casing 68, the lower side of the part (a rectangular portion) of theinner casing 68, using the upper side as an axis, like each of theconvex portions 69 b to 69 d shown in (b) ofFIG. 10 . However, it is also good to perform, in the opposite direction, such cutting and turning up outward of the upper side of the part (a rectangular portion) of theinner casing 68 using the lower side as an axis, like each of theconvex portions 69 e to 69 g shown in (c) ofFIG. 10 . Theinner casing 68 including theconvex portions 69 e to 69 g arranged in the direction is easily inserted into theouter casing 3, and increases the contact with the outer casing by the flexibility of theconvex portions 69 e to 69 g. - The above embodiment and variations of the present invention particularly describe lamps. The lamps according to the embodiment and variations are applicable to lighting apparatuses. Hereinafter, a lighting apparatus according to the present invention is described with reference to
FIG. 11 .FIG. 11 is a schematic cross sectional view of alighting apparatus 100 according to the present invention. - The
lighting apparatus 100 according to the present invention is mounted for use on aceiling 200 in a room, and includes alamp 110 and alighting tool 120 as shown inFIG. 11 . As thelamp 110, the lamp according to any one of the embodiment and variations can be used. - The
lighting tool 120 is for turning OFF and ON thelamp 110, and includes atool body 121 attached to theceiling 200 and alamp cover 122 which covers thelamp 110. - The
tool body 121 includes asocket 121 a which is screwed to thebase 111 of thelamp 110 and through which predetermined electric power is supplied to thelamp 110. - The
lighting apparatus 100 described here is a mere example. Any other lighting apparatus is possible as long as the lighting apparatus includes thesocket 121 a for screwing of thebase 111 of thelamp 110. Thelighting apparatus 100 shown inFIG. 11 includes a single lamp. However, thelighting apparatus 100 may include a plurality of lamps, for example, two or more lamps. - The lamps and lighting apparatuses according to the present invention have been described above based on the embodiment and variations. However, the present invention is not limited to the above-described embodiment and variations. Those skilled in the art will readily appreciate that many modifications are possible in the exemplary embodiments and other embodiments are possible by arbitrarily combining the structural elements of the embodiments without materially departing from the novel teachings and advantageous effects of the present invention. Accordingly, all of the modifications and other embodiments are intended to be included within the scope of the present invention.
- For example, it is possible to provide, as the protrusion provided on the inner casing of the lamp according to the present invention, the
linear portions 65 a to 65 d according to the embodiment and thelinear portions 37 a to 37 d inVariation 3. More specifically, it is possible to arrange thelinear portions 65 a to 65 d in the circumferential direction in the upper space (a position close to the LED module 4) of the inner casing, for the purposes of positioning and heat transfer, and to arrange thelinear portions 37 a to 37 d in the axis (vertical) direction in the lower space (a position inside of which the circuit device group is present) of the inner casing, for the dedicated purpose of exerting the heat transfer function. This makes it possible to increase the fixing performance of the inner casing and the heat transfer effect. - The present invention is applicable to LED lamps and lighting apparatuses, and the like which have a semiconductor light-emitting device such as an LED, and particularly to a small bulb LED lamp and a lighting apparatus using such an LED lamp that is difficult to be designed to transfer heat because of its size and structure.
-
- 1 Globe
- 2, 111 Base
- 2 a Hollow part
- 2 b Screw part
- 2 c Screw part
- 3 Outer casing
- 3 a First opening
- 3 b Second opening
- 4 LED module
- 4 a Ceramics substrate
- 4 b LED chip
- 4 c Sealing resin
- 4 d Clasp
- 5 Light source attachment member
- 5 a Concave portion
- 6, 16, 26, 36, 46, 56, 66, 68 Inner casing
- 7 lighting circuit
- 8 Insulating ring
- 10, 110 Lamp
- 16 a, 26 a, 36 a, 46 a, 56 a, 61, 66 a, 68 a First casing part
- 17, 27, 37, 47, 57, 65, 67, 69 Protrusion
- 17-17 h, 27 a-27 c, 37 a-37 d, 47 a-47 c, 65 a-65 d, 67 a Linear portion
- 57 a-57 d, 67 b-67 d Columnar portion
- 61 a First opening
- 62 Second casing part
- 62 a Second opening
- 62 b Screw-fit part
- 63 Resin cap
- 63 a Ejection part
- 63 b Through hole
- 69 a Circular portion
- 69 b-69 g Convex portion
- 71 Group of circuit elements
- 71 a, 71 b Capacitance element
- 71 c Resistance element
- 71 d Voltage conversion element
- 71 e Semiconductor device
- 72 Circuit board
- 73 a, 73 b Electrode
- 100 Lighting apparatus
- 120 Lighting tool
- 121 Tool body
- 121 a Socket
- 122 Lamp cover
- 200 Ceiling
Claims (18)
1. A lamp comprising:
a light source including a semiconductor light-emitting device;
a base through which electric power is received;
a lighting circuit including a circuit device which generates electric power for causing said light source to emit light, using the electric power received through said base;
an inner casing which is a tubular portion made of resin for housing said lighting circuit; and
an outer casing which is a tubular portion for housing said inner casing,
wherein a protrusion is provided on an outer circumferential surface of said inner casing, said protrusion directly abutting an inner circumferential surface of said outer casing, and said protrusion positionally corresponding to a circuit device which is predetermined as generating a large amount of heat from among circuit devices included in said lighting circuit.
2. The lamp according to claim 1 ,
wherein said protrusion has a linear structure extending in a circumferential direction of the outer circumferential surface of said inner casing.
3. The lamp according to claim 2 ,
wherein said protrusion has a plurality of linear portions each having the linear structure.
4. The lamp according to claim 3 ,
wherein said linear portions are arranged, at a certain interval, on a circumference on the outer circumferential surface of said inner casing.
5. The lamp according to claim 3 ,
wherein said linear portions are provided on mutually different circumferences on the outer circumferential surface of said inner casing.
6. The lamp according to claim 3 ,
wherein said inner casing includes a first opening which is open toward said light source and a second opening which is positioned opposite to said first opening, and
said linear portions include: a linear portion which is provided on a circumference that is closer to said second opening than to said first opening on the outer circumferential surface of said inner casing; and a linear portion which is provided on a circumference that is closer to said first opening than to said second opening on the outer circumferential surface of said inner casing.
7. The lamp according to claim 3 ,
wherein at least one of said linear portions is provided along an entire circumference on the outer circumferential surface of said inner casing.
8. The lamp according to claim 1 ,
wherein said protrusion includes a linear structure extending in an axis direction of said tubular portion in the outer circumferential surface of said inner casing.
9. The lamp according to claim 8 ,
wherein said protrusion includes a plurality of linear portions each having the linear structure.
10. The lamp according to claim 1 ,
wherein said protrusion includes a plurality of columnar portions each having a columnar structure which protrudes out from the outer circumferential surface of said inner casing toward an inner circumferential surface of said outer casing.
11. The lamp according to claim 10 ,
wherein said columnar portions are arranged on a circumference on the outer circumferential surface of said inner casing.
12. The lamp according to claim 11 ,
wherein said protrusion further includes a linear portion which has a linear structure extending in a circumferential direction of the outer circumferential surface of said inner casing.
13. The lamp according to claim 1 ,
wherein said protrusion is provided at least in an area which covers said circuit device and is on the outer circumferential surface of said inner casing.
14. The lamp according to claim 1 ,
wherein said protrusion is formed integrally with said inner casing.
15. The lamp according to claim 1 ,
wherein said protrusion is formed independently from said inner casing.
16. The lamp according to claim 15 ,
wherein said protrusion has a circular structure which encloses a whole circumference on the outer circumferential surface of said inner casing, and functions as said protrusion when fit into said inner casing.
17. The lamp according to claim 1 ,
wherein said protrusion is formed by cutting and turning up outward a part of a side surface of said inner casing.
18. A lighting apparatus including the lamp according to claim 1 .
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010118838 | 2010-05-24 | ||
JP2010-118838 | 2010-05-24 | ||
PCT/JP2011/000743 WO2011148536A1 (en) | 2010-05-24 | 2011-02-10 | Lamp and illumination apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
US20120161630A1 true US20120161630A1 (en) | 2012-06-28 |
US8388183B2 US8388183B2 (en) | 2013-03-05 |
Family
ID=45003538
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/393,084 Expired - Fee Related US8388183B2 (en) | 2010-05-24 | 2011-02-10 | Lighting apparatus and lamp having a protrusion on an outer surface of an inner casing abutting an inner surface of an outer casing thereof |
Country Status (5)
Country | Link |
---|---|
US (1) | US8388183B2 (en) |
EP (1) | EP2527719A4 (en) |
JP (1) | JP5050133B2 (en) |
CN (1) | CN102472464B (en) |
WO (1) | WO2011148536A1 (en) |
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US20140078753A1 (en) * | 2012-09-18 | 2014-03-20 | Toshiba Lighting & Technology Corporation | Luminaire |
US20140240994A1 (en) * | 2013-02-28 | 2014-08-28 | Lg Innotek Co., Ltd. | Lighting device |
WO2014169224A1 (en) * | 2013-04-11 | 2014-10-16 | Marvell World Trade Ltd. | Light emitting diode receptacle |
DE102014101403A1 (en) * | 2013-05-15 | 2014-11-20 | Seidel GmbH & Co. KG | lighting device |
US20150204532A1 (en) * | 2014-01-22 | 2015-07-23 | Samsung Electronics Co., Ltd. | Led lighting apparatus |
US20160084489A1 (en) * | 2014-09-24 | 2016-03-24 | Kabushiki Kaisha Toshiba | Heat sink having heat dissipating fin and lighting device |
US20180054978A1 (en) * | 2016-08-30 | 2018-03-01 | GE Lighting Solutions, LLC | Luminaire including a heat dissipation structure |
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JP5469177B2 (en) * | 2009-09-30 | 2014-04-09 | パナソニック株式会社 | Lighting device |
TWM403609U (en) * | 2010-12-02 | 2011-05-11 | Nexgen Mediatech Inc | Illumination device and lamp housing having both heat-dissipation and light source diffusion functions |
JP5451947B2 (en) * | 2012-01-12 | 2014-03-26 | パナソニック株式会社 | Lamp part, lamp and method of manufacturing lamp |
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US10270359B2 (en) | 2016-03-25 | 2019-04-23 | New Energies & Alternative Technologies, Inc. | Multi-use driver circuits |
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Also Published As
Publication number | Publication date |
---|---|
CN102472464A (en) | 2012-05-23 |
CN102472464B (en) | 2013-05-01 |
EP2527719A4 (en) | 2013-07-17 |
WO2011148536A1 (en) | 2011-12-01 |
US8388183B2 (en) | 2013-03-05 |
JPWO2011148536A1 (en) | 2013-07-25 |
EP2527719A1 (en) | 2012-11-28 |
JP5050133B2 (en) | 2012-10-17 |
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